### Write Tags with lltag

Source: https://github.com/dhowden/tag/blob/master/testdata/README.md

This example demonstrates how to use the `lltag` command-line tool to write various metadata tags (artist, title, album, genre, year, etc.) to sample audio files. It shows common options for setting basic tags and custom tags using the `--tag` flag.

```sh
lltag sample.* \
  -a "Test Artist" \
  -t "Test Title" \
  -A "Test Album" \
  -n "3" \
  -g "Jazz" \
  -d "2000" \
  -c "Test Comment" \
  --tag ALBUMARTIST="Test AlbumArtist" \
  --tag COMPOSER="Test Composer"\
  --tag DISCNUMBER="02" \
  --tag TRACKTOTAL="06"
```

--------------------------------

### Go: Detect and Parse Audio Metadata from io.ReadSeeker

Source: https://github.com/dhowden/tag/blob/master/README.md

Demonstrates how to read and parse metadata from an audio file using the tag package. It takes an io.ReadSeeker as input and returns a Metadata interface containing parsed information or an error.

```go
import (
	"log"
	"os"
	"github.com/dhowden/tag"
)

func main() {
	// Assuming 'f' is an opened *os.File that implements io.ReadSeeker
	f, err := os.Open("your_audio_file.m4a")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	m, err := tag.ReadFrom(f)
	if err != nil {
		log.Fatal(err)
	}
	log.Print(m.Format()) // The detected format.
	log.Print(m.Title())  // The title of the track.
}
```

--------------------------------

### CLI: Tag and Sum Audio File Metadata

Source: https://github.com/dhowden/tag/blob/master/README.md

Shows how to use the command-line tools provided by the package to extract metadata from an audio file and calculate its audio data checksum. The 'tag' command displays metadata, while the 'sum' command outputs a SHA1 hash.

```console
$ go install github.com/dhowden/tag/cmd/tag@latest
$ cd $GOPATH/bin
$ ./tag 11\ High\ Hopes.m4a
Metadata Format: MP4
Title: High Hopes
Album: The Division Bell
Artist: Pink Floyd
Composer: Abbey Road Recording Studios/David Gilmour/Polly Samson
Year: 1994
Track: 11 of 11
Disc: 1 of 1
Picture: Picture{Ext: jpeg, MIMEType: image/jpeg, Type: , Description: , Data.Size: 606109}

$ ./sum 11\ High\ Hopes.m4a
2ae208c5f00a1f21f5fac9b7f6e0b8e52c06da29
```

--------------------------------

### Go: Metadata Interface Definition

Source: https://github.com/dhowden/tag/blob/master/README.md

Defines the Metadata interface, which provides a consistent way to access metadata across different audio file formats supported by the library. It includes methods for retrieving title, album, artist, track/disc numbers, artwork, and raw tag data.

```go
import "github.com/dhowden/tag"

// Metadata is an interface which is used to describe metadata retrieved by this package.
type Metadata interface {
	Format() tag.Format
	FileType() tag.FileType

	Title() string
	Album() string
	Artist() string
	AlbumArtist() string
	Composer() string
	Genre() string
	Year() int

	Track() (int, int) // Number, Total
	Disc() (int, int) // Number, Total

	Picture() *tag.Picture // Artwork
	Lyrics() string
	Comment() string

	Raw() map[string]interface{} // NB: raw tag names are not consistent across formats.
}
```

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